ArticleACS omega2025
Sweep-Volume Enlargement by a Polymer under High-Temperature and High-Salinity Conditions: Visual Research Using Computed Tomography.
Article in ACS omega, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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6 authors.
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Abstract
The thickening capacity of a polymer in a high-temperature and high-salinity environment is restricted, damaging its performance in expanding the sweep volume and enhancing oil recovery. A special temperature- and salt-resistant polymer (TSRP) was used for viscosity evaluation, more importantly, the joint polymer flooding tests and computed tomography (CT) scans of oil distribution in cores. Thus, the stability of such a polymer under harsh conditions and sweep-volume enlargement by the polymer in heterogeneous cores could be observed visually. The results show that TSRP can be stable at 85 °C and a high salinity of 58,002 mg/L, but its viscosity is significantly reduced when increasing the salinity from 3356.0 to 58,002 mg/L, which hinders oil flooding. However, when the heterogeneity of cores is relatively weak with a permeability contrast (PC) of 1.0-5.0, TSRP can effectively sweep the low-permeability layer, reaching a greater incremental oil recovery of 24.1-28.8%. As the heterogeneity increases significantly to a PC value of 7, TSRP fails to activate the low-permeability layer, and oil recovery can only be enhanced by 18.2%. The surfactant-polymer (SP) system can indeed achieve greater incremental oil recovery of 22.9-34.1%, but it does not significantly outperform a single polymer in sweep-volume enlargement at a PC of 7. Increases in the core size and corresponding thickness of the low-permeability layer do not significantly affect the performance of the polymer in sweep-volume enlargement and oil recovery.
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